A previous commenter on this topic (Richard) would seem to have some authority … based on his email address, which you can’t see.

At any rate, whether or not the music in the video is plagiarism isn’t a simple question to answer, at least not for me. Since Glass uses such basic musical building blocks in his compositions it can be hard to separate out what’s his and what is the property of all of us.

Still, as I say, there are some recognizable Glassian aspects to the piece in the video, and it doesn’t sound like Reich or Adams at all.